Nozzle for JPN Extruder for CMYK+ colorprinting

thingiverse

I wonder if something like this might work. Possible to either machine in two parts or even one block? The PTFE tubes enters the into nozzle (like in MK10) but the nozzle acts also the heating block. Obviously the tricky part is to drill those 0.4mm channels? The entering channels crossing forms the cavity to allow colors to mix. Keeping filaments separated as far as possible reduce the hysteresis and there for filament waste, when the sharp color change is needed.